Top block for a snow fence



FIG. 1 is a perspective of a top block for a snow fence of the present invention;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a left side view thereof, the right side view is a mirror image of the left side view.

The parts shown by means of broken lines in the reproductions are not part of the claimed design. 

CLAIM The ornamental design for a top block for a snow fence, as shown and described. 